<template>
    <div>
        <!-- 面包屑导航区 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>分类参数</el-breadcrumb-item>
        </el-breadcrumb>
        <!-- 卡片视图 -->
        <el-card>
            <!-- 警告区域 -->
            <el-alert title="注意：只允许为第三级分类设置相关参数" type="warning" :closable="false" show-icon>
            </el-alert>

            <!-- 选择商品分类区域 -->
            <el-row class="car_opt">
                <span>选择商品分类：</span>
                <!-- 选择商品分类的级联选择框 -->
                <el-cascader v-model="selectedCateKeys" :options="cateList" :props="cateProps" @change="handleChange">
                </el-cascader>
            </el-row>

            <!-- tab页签区 -->
            <el-tabs v-model="activeName" @tab-click="handleTabClick">
                <!-- 添加动态参数面板 -->
                <el-tab-pane label="动态参数" name="many">
                    <!-- 添加参数的按钮 -->
                    <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加参数
                    </el-button>
                    <!-- 动态参数表格 -->
                    <el-table :data="manyTableData" border stripe>
                        <!-- 展开行 -->
                        <el-table-column type="expand">
                            <template v-slot="scope">
                                <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)">{{item}}</el-tag>

                                <el-input class="input-new-tag" v-if="scope.row.inputVisible"
                                    v-model="scope.row.inputValue" ref="saveTagInput" size="small"
                                    @keyup.enter.native="handleInputConfirm(scope.row)"
                                    @blur="handleInputConfirm(scope.row)">
                                </el-input>
                                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+
                                    New Tag
                                </el-button>
                            </template>
                        </el-table-column>
                        <!-- 索引列 -->
                        <el-table-column type="index" label="#"></el-table-column>
                        <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                        <el-table-column label="操作">
                            <template v-slot="scope">
                                <el-button type="primary" size="mini" icon="el-icon-edit"
                                    @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                                <el-button type="danger" size="mini" icon="el-icon-delete"
                                    @click="deleteParams(scope.row.attr_id)">删除
                                </el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
                <!-- 添加静态属性面板 -->
                <el-tab-pane label="静态属性" name="only">
                    <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加属性
                    </el-button>
                    <!-- 静态参数表格 -->
                    <el-table :data="onlyTableData" border stripe>
                        <!-- 展开行 -->
                        <el-table-column type="expand">
                            <template v-slot="scope">
                                <!-- 循环渲染Tag标签 -->
                                <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable
                                    @close="handleClose(i, scope.row)">{{item}}</el-tag>
                                <!-- 输入的文本框 -->
                                <el-input class="input-new-tag" v-if="scope.row.inputVisible"
                                    v-model="scope.row.inputValue" ref="saveTagInput" size="small"
                                    @keyup.enter.native="handleInputConfirm(scope.row)"
                                    @blur="handleInputConfirm(scope.row)">
                                </el-input>
                                <!-- 添加按钮 -->
                                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                            </template>
                        </el-table-column>
                        <!-- 索引列 -->
                        <el-table-column type="index" label="#"></el-table-column>
                        <el-table-column label="属性名称" prop="attr_name"></el-table-column>
                        <el-table-column label="操作">
                            <template v-slot="scope">
                                <el-button type="primary" size="mini" icon="el-icon-edit"
                                    @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                                <el-button type="danger" size="mini" icon="el-icon-delete"
                                    @click="deleteParams(scope.row.attr_id)">删除
                                </el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
            </el-tabs>
        </el-card>

        <!-- 添加参数对话框 -->
        <el-dialog :title="'添加'+titleText" :visible.sync="addDialogVisible" width="50%" @close="addDialogClosed">
            <!-- 添加参数对话框 -->
            <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
                <el-form-item :label="titleText" prop="attr_name">
                    <el-input v-model="addForm.attr_name"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="addDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="addParams">确 定</el-button>
            </span>
        </el-dialog>
        <!-- 修改参数对话框 -->
        <el-dialog :title="'添加'+titleText" :visible.sync="editDialogVisible" width="50%" @close="editDialogClosed">
            <!-- 修改参数对话框 -->
            <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
                <el-form-item :label="titleText" prop="attr_name">
                    <el-input v-model="editForm.attr_name"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="editDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="editParams">确 定</el-button>
            </span>
        </el-dialog>
    </div>
</template>

<script>
    export default {
        name: 'Params',

        data() {
            return {
                cateList: [],
                cateProps: {
                    expandTrigger: 'hover',
                    value: 'cat_id',
                    label: 'cat_name',
                    children: 'children'
                },
                selectedCateKeys: [],
                activeName: 'many',
                manyTableData: [],
                onlyTableData: [],
                addDialogVisible: false,
                addForm: {
                    attr_name: '',
                },
                addFormRules: {
                    attr_name: [
                        { required: true, message: '请输入参数名称', trigger: 'blur' }
                    ]
                },
                editDialogVisible: false,
                editForm: {},
                editFormRules: {
                    attr_name: [
                        { required: true, message: '请输入参数名称', trigger: 'blur' }
                    ]
                },
            };
        },

        created() {
            this.getCateList()
        },

        computed: {
            isBtnDisabled() {
                if (this.selectedCateKeys.length !== 3) {
                    return true
                }
                return false
            },
            // 当前选中的三级分类的id
            cateId() {
                if (this.selectedCateKeys.length === 3) {
                    return this.selectedCateKeys[2]
                }
                return null
            },
            titleText() {
                if (this.activeName === 'many') {
                    return '动态参数'
                }
                return '静态属性'
            },

        },

        methods: {
            async getCateList() {
                const { data: res } = await this.$http.get('categories')
                if (res.meta.status !== 200) {
                    return this.$message.error('获取商品分类失败！')
                }
                this.cateList = res.data
            },
            // 级联选择框中项变化，会触发这个函数
            handleChange() {
                this.getParamsData()
            },
            // tab页签点击事件处理函数
            handleTabClick() {
                this.getParamsData()
            },
            // 获取参数的列表数据
            async getParamsData() {
                // 证明选中的不是三级分类
                if (this.selectedCateKeys.length !== 3) {
                    this.selectedCateKeys = []
                    this.manyTableData = []
                    this.onlyTableData = []
                    return
                }

                // 证明选中的是三级分类
                // console.log(this.selectedCateKeys);
                // 根据所选的id和面板获取参数
                const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, {
                    params: { sel: this.activeName }
                })

                if (res.meta.status !== 200) {
                    return this.$message.error('获取参数列表失败')
                }
                res.data.forEach(item => {
                    item.attr_vals = item.attr_vals ? item.attr_vals.split(',') : []
                    // 控制文本的显示与隐藏
                    item.inputVisible = false
                    // 文本输入框的值
                    item.inputValue = ''
                })
                console.log(res.data)
                if (this.activeName === 'many') {
                    this.manyTableData = res.data
                } else {
                    this.onlyTableData = res.data
                }
            },
            addDialogClosed() {
                this.$refs.addFormRef.resetFields()
            },
            addParams() {
                this.$refs.addFormRef.validate(async valid => {
                    if (!valid) return
                    const { data: res } = await this.$http.post(
                        `categories/${this.cateId}/attributes`,
                        {
                            attr_name: this.addForm.attr_name,
                            attr_sel: this.activeName
                        }
                    )
                    if (res.meta.status !== 201) {
                        return this.$message.error('添加参数失败！')
                    }
                    this.$message.success('添加参数成功！')
                    this.addDialogVisible = false
                    this.getParamsData()
                })
            },
            async showEditDialog(attr_id) {
                const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`, {
                    params: { attr_sel: this.activeName }
                })
                if (res.meta.status !== 200) {
                    return this.$message.error('获取参数信息失败')
                }
                this.editForm = res.data

                this.editDialogVisible = true
            },
            editDialogClosed() {
                this.$refs.editFormRef.resetFields()
            },
            editParams() {
                this.$refs.editFormRef.validate(async valid => {
                    if (!valid) return
                    const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`, {
                        attr_name: this.editForm.attr_name,
                        attr_sel: this.activeName
                    })
                    if (res.meta.status !== 200) {
                        return this.$message.error('修改参数失败')
                    }
                    this.$message.success('修改参数成功')
                    this.getParamsData()
                    this.editDialogVisible = false
                })
            },
            async deleteParams(attr_id) {
                const confirmResult = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
                    confirmButtonText: '确定',
                    cancelButtonText: '取消',
                    type: 'warning'
                }).catch(err => err)

                if (confirmResult !== 'confirm') {
                    return this.$message.info('取消删除')
                }
                const { data: res } = await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)

                if (res.meta.status !== 200) {
                    return this.$message.error('删除参数失败')
                }
                this.$message.success('删除参数成功')

                this.getParamsData()
            },
            showInput(row) {
                row.inputVisible = true
                this.$nextTick(_ => {
                    this.$refs.saveTagInput.$refs.input.focus();
                })
            },
            handleInputConfirm(row){
                if (row.inputValue.trim().length === 0) {
                    row.inputValue = ''
                    row.inputVisible = false
                    return
                }
                row.attr_vals.push(row.inputValue.trim())
                row.inputValue = ''
                row.inputVisible = false

                this.saveAttrValis(row)
            },
            async saveAttrValis(row){
                const {data:res} = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,{
                    attr_name: row.attr_name,
                    attr_sel: row.attr_sel,
                    attr_vals: row.attr_vals.join(',')
                })

                if(res.meta.status !== 200) {
                    return this.$message.error('修改参数失败')
                }
                this.$message.success('修改参数成功')
            },
            handleClose(i,row){
                row.attr_vals.splice(i,1)
                this.saveAttrValis(row)
            }
        },

    };
</script>

<style scoped>
    .car_opt {
        margin: 15px 0;
    }

    .el-tag {
        margin: 10px;
    }

    .input-new-tag {
        width: 100px;
    }
</style>